41CL Self-Update

[Sylvain Cote]

(11-18-2017 04:57 PM)Neve Wrote:  Everything is fine until I need to get the “A” and “B” letters. I have nothing at all.
No “A” when I XEQ CMOPEN, and typing “B” doesn’t do anything, the keyboard is not even responding.
However, the driver seems to be OK as I do have /dev/tty.usbserial

ok, serial communication does not work.

First, the screen application is not configured by default to echo local typed characters on the keyboard, so that you see nothing when you type B is normal.

Second, it would be safe to assume that the USB-to-Serial dongle is working correctly because the drivers sees it.
The only way to be 100% safe would be to use the dongle with another serial device and see if it works.
Another way is to put a RS232 serial tester like this one between the cables and visually monitor if the RX & TX lines operates correctly.

FYI, the 41CL is configured as a communication (DCE) device while the computer is configured as a terminal (DTE) device, this is why you do not need a null-modem adapter between them.
This mean that when the 41CL transmitting the RX led is flashing and when the computer is transmitting the TX led is flashing on the serial tester.

If I were you, I would put my effort to see if the internal serial cable is not reversed and correctly inserted into the 41CL board, I would also inspect the cable to see that no wires has been cut, then I would redo the tests.

Sylvain

edit: typos